High-voltage test transformers will fail in normal use, but small faults such as short circuits can actually be avoided. Now just like everyone introduces the common faults and solutions of high-voltage test transformers in detail.
1. The line cake is bent up and down. This damage is caused by the permanent deformation of the wire between the two axial pads under the action of the axial electromagnetic force due to the excessive bending moment, and the deformation between the two cakes is usually symmetrical.
2, axial instability. This kind of damage is mainly caused by the axial electromagnetic force generated by the radial magnetic leakage, which causes the axial deformation of the transformer winding.
3. The winding or wire cake collapsed. This kind of damage is due to the fact that the wires squeeze or collide with each other under the action of axial force, resulting in tilting deformation. If the wire is originally inclined slightly, the axial force will increase the inclination, and collapse in severe cases; the larger the ratio of the height to the width of the wire, the more likely it is to cause collapse. In addition to the axial component, the end leakage magnetic field also has a radial component. The combined electromagnetic force generated by the magnetic leakage in the two directions causes the inner winding wire to flip inward and the outer winding to flip outward.
4. The winding rises to spread the pressure plate. Such damage is often due to excessive axial force or insufficient strength or rigidity of the end support or defective assembly.
5. Radial instability. This kind of damage is mainly caused by the radial electromagnetic force generated by the axial magnetic leakage, which causes the radial deformation of the transformer winding.
6. The extension of the outer winding wire leads to insulation damage. The radial electromagnetic force attempts to increase the diameter of the outer winding, and when the tensile stress acting on the wire is too much, it will cause permanent deformation. This kind of deformation is usually accompanied by damage to the wire insulation and causes a short circuit between turns. In severe cases, the coil will be embedded, disordered, and collapsed, or even broken.
7, the winding end is turned over and deformed. In addition to the axial component, the end leakage magnetic field also has a radial component. The combined electromagnetic force generated by the magnetic leakage in the two directions causes the winding wire to flip inward, and the outer winding flips outward.
8. The inner winding wire is bent or warped. The radial electromagnetic force reduces the diameter of the inner winding, and the bending is the result of permanent deformation caused by the excessive bending moment of the wire between the two supports (inner stays). If the core is bound tightly enough and the winding radial stays are effectively supported, and the radial electromotive force is evenly distributed in the circumferential direction, this deformation is symmetrical, and the entire winding is a polygon star. However, due to the compression and deformation of the iron core, the support conditions of the stays are not the same, and the force along the winding circumference is uneven, and in fact, local instability often occurs and warps and deformations occur.
The editor of Baoding Weisheng Power Equipment Technology Co., Ltd. summarizes: high-voltage test transformers are the core part of the power system. Simple troubleshooting and maintenance are necessary common sense. I hope that today’s sharing will be helpful to everyone. Welcome to inquire.